Speaker-element and speaker comprising such a speaker-element

Abstract

A speaker-element for a speaker includes two substantially mutually opposing spaced apart membrane planes, where each membrane plane comprises at least one electromagnetic wire arranged for creating a magnetic field upon an electric current passing through the electromagnetic wire. A permanent magnet is arranged between the two membrane planes, the electromagnet wires of the two membrane planes are connectable to an electric power source so that the electric current passes therethrough in substantially mutually opposing directions to create substantially mutually opposing magnetic fields, such that upon passing an electric current through the electromagnetic wire of each membrane plane said membrane planes are both either attracted towards or repulsed from the permanent magnet and thereby moved towards or away from each other, respectively, thereby producing a sound wave.

The invention claimed is: 
     
       1. A speaker comprising a plurality of speaker-elements, each speaker element comprising:
 two substantially mutually opposing spaced apart membrane planes, 
 wherein each membrane plane comprises at least one electromagnetic wire arranged for creating a magnetic field upon an electric current passing through said electromagnetic wire, 
 wherein at least one permanent magnet is arranged between the two membrane planes, 
 wherein the electromagnet wires of the two membrane planes are connectable to an electric power source such that the electric current passes therethrough in substantially mutually opposing directions and thereby creates substantially mutually opposing magnetic fields such that upon passing an electric current through the electromagnetic wire of each membrane plane said membrane planes are both either attracted towards or repulsed from the permanent magnet and thereby moved towards or away from each other, respectively, thereby producing a sound wave, 
 wherein said plurality of speaker-elements are arranged in a radial direction with respect to said central longitudinal line and spaced apart by an angular distance. 
 
     
     
       2. The speaker according to  claim 1 , wherein each said electromagnetic wire is arranged substantially in a middle line of each said membrane plane, such that substantially equal membrane parts are arranged on both sides of said electromagnetic wire. 
     
     
       3. The speaker according to  claim 1 , wherein said permanent magnet extends substantially parallel to the at least two electromagnetic wires with a longitudinal length thereof in such a manner that the at least two electromagnetic wires are arranged in front of two opposing longitudinal surfaces of the permanent magnet. 
     
     
       4. The speaker according to  claim 1 , wherein said two substantially mutually opposing membrane planes are arranged at an oblique angle with respect to each other, said angle being chosen between 0° and 75°. 
     
     
       5. The speaker according to  claim 1 , wherein said two membrane planes together define a circumferential edge zone having a first part at a converging end of the speaker element and a second part at a diverging end of the speaker element, which circumferential edge zone is closed over the first part and open over the second part. 
     
     
       6. The speaker according to  claim 1 , wherein each membrane plane comprises four of said electromagnetic wires, which four wires are arranged in parallel to each other with no or a small mutual distance. 
     
     
       7. The speaker according to  claim 1 , wherein each said electromagnetic wire is a copper wire. 
     
     
       8. The speaker according to  claim 1 , wherein each electromagnetic wire is attached to the membrane plane using a polyimide tape. 
     
     
       9. The speaker according to  claim 1 , comprising a frame for holding a circumferential edge of each membrane plane, wherein the circumferential edge of each membrane plane is arranged between two frame parts of said frame and held tight thereby. 
     
     
       10. The speaker according to  claim 9 , comprising two angular profiles made of a flexible and/or compressible material, said angular profiles being arranged between said frame parts in the area of said circumferential edge of the membrane plane for tensioning said membrane plane. 
     
     
       11. The speaker according to  claim 1 , wherein five of said speaker-elements are provided which are spaced apart over an angular distance of about 60°. 
     
     
       12. The speaker according to  claim 11 , wherein at least one further series of five of said speaker-elements is provided which are spaced apart over an angular distance of about 60°, and wherein the at least one further series is arranged on top of said five speaker-elements in such a manner that the speaker-elements are aligned. 
     
     
       13. A speaker, comprising a plurality of speaker-elements, each speaker-element comprising two substantially mutually opposing spaced apart membrane planes, wherein each membrane plane comprises at least one electromagnetic wire arranged for creating a magnetic field upon an electric current passing through said electromagnetic wire, wherein at least one permanent magnet is arranged between the two membrane planes, wherein the electromagnet wires of the two membrane planes are connectable to an electric power source in such a manner, that the electric current passes there trough in substantially mutually opposing directions and thereby creating substantially mutually opposing magnetic fields, such that upon passing an electric current through the electromagnetic wire of each membrane plane said membrane planes are both either attracted towards or repulsed from the permanent magnet and thereby moved towards or away from each other, respectively, thereby producing a sound wave,
 wherein the plurality of speaker elements are spaced along and aligned with each other along an imaginary line with one membrane plane of one speaker-element substantially facing a membrane plane of an adjacent speaker-element, thereby forming a column of speaker elements. 
 
     
     
       14. The speaker according to  claim 13 , wherein the imaginary line along which the speaker-elements are arranged comprises a first section which is straight, and a second section which is curved. 
     
     
       15. The speaker according to  claim 13 , wherein said two substantially mutually opposing membrane planes are arranged at an oblique angle with respect to each other, said angle being between 0° and 75°. 
     
     
       16. The speaker according to  claim 13 , wherein each electromagnetic wire is arranged substantially in a middle line of each membrane plane, such that substantially equal membrane parts are arranged on both sides of said electromagnetic wire. 
     
     
       17. The speaker according to  claim 13 , wherein said two membrane planes together define a circumferential edge zone, which circumferential edge zone is closed over a first part and open over a second part. 
     
     
       18. The speaker according to  claim 13 , comprising a frame for holding a circumferential edge of each membrane plane, wherein the circumferential edge of each membrane plane is arranged between two frame parts of said frame and held tight thereby. 
     
     
       19. A speaker-element for a speaker, comprising two substantially mutually opposing spaced apart membrane planes, wherein each membrane plane comprises at least one electromagnetic wire arranged for creating a magnetic field upon an electric current passing through said electromagnetic wire, wherein at least one permanent magnet is arranged between the two membrane planes, wherein the electromagnet wires of the two membrane planes are connectable to an electric power source in such a manner, that the electric current passes there trough in substantially mutually opposing directions and thereby creating substantially mutually opposing magnetic fields, such that upon passing an electric current through the electromagnetic wire of each membrane plane said membrane planes are both either attracted towards or repulsed from the permanent magnet and thereby moved towards or away from each other, respectively, thereby producing a sound wave, wherein the speaker element further comprises a frame for holding a circumferential edge of each membrane plane, wherein the circumferential edge of each membrane plane is arranged between two frame parts of said frame and held tight thereby. 
     
     
       20. The speaker-element according to  claim 19 , comprising two angular profiles made of a flexible and/or compressible material, such as rubber, said angular profiles being arranged between said frame parts in the area of said circumferential edge of the membrane plane, for tensioning said membrane plane.